Method of casting.



L. EDEL.

METHOD OF CASTiNG.

APPLICATION FILED NOV. 29, 1916.

Patented May 1, 1917.

ZZ/Mw/r I lac/ya $0 0414,

IIIT ATE ATENT OFFIQ.

LUCAS EDEL, OF ST. LOUIS, MISSOURI.

METHOD OF CASTING.

Application filed November 29,1916.

T 0 all whom it may concern:

Be it known that I, LUCAS EDEL, a citizen of the United States ofAmerica, and a resident of the city of St. Louis, State of Missouri,have invented certain new and useful Improvements in Methods of Casting,of which the following is a full, clear, and exact description,reference being had to the accompanying drawing, forming a part of thisspecification.

My inventionhas for its object the production of a casting in suchmanner as to provide therein an undercut hole into which a rivet may bedriven and spread to secure it to the casting. This object is attainedby my simple and inexpensive method of castmg.

Figure I is a fragmentary view of a mold prepared in accordance with mymethod with a pattern therein.

Fig. II is a view similar to Fig. I showing a casting in the mold.

Fig. III is a cross section through a cast ing produced by my method,showing a rivet driven into the casting and serving to hold a thirdmember thereto.

In carrying out my method, I make use of a sand mold and prepare themold cavityby laying a pattern in the sand in one sectlon of the moldand ramming the sand therearound. The pattern used is provided with acavity the location of which corresponds to the location at which therivet cavity is to be produced in the casting, and into this cavity inthe pattern I introduce the stem of a core which-terminates in anenlargement and is carried by a main body portion. The cavity in thepattern is of greater diameter throughout its length than the diameterof the enlargement at the end of the core stem, and, consequently, thestem of the core may be readily inserted into and withdrawn from saidcavity.

After the core has been inserted in the pattern, as explained, I preparethe second section of the mold, ramming the sand therein against thepattern and around the body of the core which projects above the patterninto the upper section of the mold.

When the described steps have been carried out, I lift the upper sectionof the mold off of the lower section, and the core, remaining seated inthe upper section, withdraws or separates from the pattern embedded inthe lower section. The pattern is then removed from the lower sectionleaving Specification of Letters Patent.

Patented May 1, 191?.

Serial No. 134,032.

a cavity and the upper section is replaced on to the lower section thuscausing the stem of the core to be positioned in the mold cavity. Moltenmetal or other mobile casting material being poured into the mold fillsthe mold cavity and encircles the stem of the core, so that said stemwith its enlarged end becomes embedded in the metal and produces anundercut cavity therein of a contour corresponding to that of the stemand its enlargement. The casting is then taken from the mold and thecore is removed therefrom by destroying it through disintegrationleaving the undercut cavity which is adapted to receive a rivet andcause the spreading thereof when the rivet is placed in the cavity anddriven against the material at the bottom of the cavity.

The preferred procedure in practising my method is as follows:

I first prepare a pattern A in any ordinary and well known manner andprovide therein a recess or pocket at which I locate in the pattern at apoint corresponding to that at which I desire to form a rivet cavity inthe casting to be molded. Said pocket extends only part way through thepattern and is preferably circular in cross section. I place the patternon a follow-board 1 with the mouth of the pocket at facing said board,then place the drag 2 of a flask on said follow-board and fill it withsand which is then rammed around the pattern. The drag is next invertedto place the pattern at the top of the sand with the pocket a exposed.

A destructible core B (preferably of sand) is prepared 'and arranged inthe pocket in the pattern before the cope of the flask is put in placeand filled with sand. This core comprises a head 3 of tapered or othershape which provides for the head of the core being firmly held in thesand in the cope when it is rammed. The core also includes a stem 4 ofless diameter than the diameter of the pocket at in the pattern, saidstem terminating in an enlargement 5.

The core B is applied to the pattern by inserting its stem into thepocket (6, and when the core is so applied, the terminal enlargement 5of the cope is at the bottom of said pocket.

The cope 6 of the flask is now mounted on the drag filled with sand andrammed so that the mold, with the pattern therein, will be complete asillustrated in Fig. I. The cope is then lifted from the drag carryingwith it the core B which is then withdrawn from the pocket in thepattern. After removing the pattern from the drag, the cope, with thecore still present therein, is replaced on or returned to the drag, andcasting material in molten condition is poured into the mold cavity tofill it and inclose the stem of the core and its enlargement 5, as seenin Fig. II. The result is the formation of a cavity in the castinghaving an undercut inner end of larger diameter than the portion of thecavity produced by the stem of the core. A rivet driven into such acavity spreads at its inner end into the undercut base portion of thecavity as illustrated in Fig. III, whereby the rivet is securelyattached to the casting.

I claim 1.- The method of producing a casting having an undercut rivetcavity therein, which consists in placing a pattern having a pockettherein in a flask drag, pouring sand into the flask drag and tamping itabout the pattern, introducing into the pocket a core having anenlargement at its end which enters the pocket, applying a flask cope,pouring in green sand and tamping it about the core, opening the mold,removing the pattern therefrom, closing the mold, thereby returning thecore so that the enlargement at its terminal end will project into thecavity left by the removal of the pattern, and then pouring castingmaterial in mobile condition into the cavity.

2. The method of producing a casting having an undercut rivet cavitytherein, which consists in placing a pattern having a pocket therein ina first mold section, pouring green sand into the first mold section andtamping it about the pattern, introducing into the pocket a core havingan enlargement at its end which enters the pocket and also having-anenlargement toward its opposite end forming a second mold section abovethe first mold section and about the exposed portion of the core, so

that that part of the core will be embedded in the second mold section,removing the second mold section with the core therein, removing thepattern from the first mold section, replacing the second mold sectionupon the first mold section so that the portion of the core which hadprojected into the pocket in the pattern will project into the cavityleft by the removal of the pattern and thereafter pouring castingmaterial in mobile condition into said mold cavity.

LUCAS EDEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. G.

